Heya ! A lot of these builds are from us over at The VoxelBox - we've recently moved our downloads from Planet Minecraft to the MCForums, you can dl them over on our mega-release thread here: http://www.minecraftforum.net/topic/2644723-the-voxelbox-mega-release-topic/ as well as more updates from us :] we've been doing a daily release every day until our relaunch on June 1st, so go grab them and enjoy!

Aha, every time I see awesome builds like these, I start to think about how much less awesome my buildings are... haha
Anyways, wow! It's good to hear that such awesome things in Minecraft are getting recognition!